<!DOCTYPE HTML>
<html>
  <head>
    <title>grid-syste test</title>
    <meta charset="utf-8" />
    <link rel="stylesheet" href="./style.css">
    <style>
      .fixed-container {
        margin-top: 10px;
        margin-bottom: 10px;
      }
      .row {
        margin-bottom: 20px;
      }
      .column1, .column4, .column8, .column6, .column12 {
        background-color: red;
      }
    </style>
  </head>
  <body>
    <div class="container">
      <div class="row">
        <div class="column1">1</div>
        <div class="column1">1</div>
        <div class="column1">1</div>
        <div class="column1">1</div>
        <div class="column1">1</div>
        <div class="column1">1</div>
        <div class="column1">1</div>
        <div class="column1">1</div>
        <div class="column1">1</div>
        <div class="column1">1</div>
        <div class="column1">1</div>
        <div class="column1">1</div>
      </div>
      <div class="row">
        <div class="column4">4</div>
        <div class="column4">4</div>
        <div class="column4">4</div>
      </div>
      <div class="row">
        <div class="column4">4</div>
        <div class="column8">8</div>
      </div>
      <div class="row">
        <div class="column6">6</div>
        <div class="column6">6</div>
      </div>
      <div class="row">
        <div class="column12">12</div>
      </div>
    </div>
  </body>
</html>
